by W. Silva and N.A. Abrahamson
Silva, W., and N.A. Abrahamson (1992). Quantification of Long Period Strong Ground Motion Attenuation for Engineering Design. SMIP92
Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 2-1 - 2-9.
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Empirical strong motion recordings from large magnitude (M ≥ 6) events are reprocessed with an
emphasis toward preserving the long period motions. A preliminary empirical attenuation
relationship for response spectral values is derived for the period range, 1-20 seconds.